Custom http.conf for subdomains - apache

Question

I tried all the ways I knew, But...
Let me explain with an example what I want.
I have a blog service, with main domain and many domain pointers and subdomains.
Main domain: blog.com
Subdomains: sub1.blog.com, sub2.blog.com, sub3.blog.com and....
Domain pointers : domain1.com , domain2.com, domain3.com and...
Every domain redirect to a spacial subdomain with Php code
But, what is the problem?
When i add a Subdomain (for exapmle sub2.blog.com) to Sub Domains, in user httpd.conf create VirtualHost settings for All domain pointers (sub2.domain1.com, sub2.domain2.com, sub2.domain3.com and...) ... But i don't want it!!!
And what is the big problem ???
for example if i had 600 domain pointer, with create 500 subdomains, httpd add 3000000 (500x600) VirtualHost settings to user httpd.conf file. and httpd.conf file size will be very large.
What will be the result?
A big time needed to create httpd.conf file
Server load coming to very High
Apache server Crash
And...
I want Subdomain VirtualHost just create for Main Domain (sub2.blog.com) , not for Domain Pointers... I don't need sub2.domain1.com or others...
What can i do for this ? Help me Guys
Can I change rewrite_confs script to do what i want it?
Or any way....???
Here the VirtualHost settings that happened to me:(
<VirtualHost 88.88.88.88:80 >
ServerName www.sub1.domain1.com
ServerAlias www.sub1.domain1.com sub1.domain1.com
ServerAdmin webmaster#blog.com
DocumentRoot /home/blog/domains/blog.com/public_html/sub1
UseCanonicalName OFF
<IfModule !mod_ruid2.c>
SuexecUserGroup blog blog
</IfModule>
CustomLog /var/log/httpd/domains/blog.com.sub1.bytes bytes
CustomLog /var/log/httpd/domains/blog.com.sub1.log combined
ErrorLog /var/log/httpd/domains/blog.com.sub1.error.log
<Directory /home/blog/domains/blog.com/public_html/sub1>
AllowOverride AuthConfig FileInfo Indexes Limit Options=Indexes,IncludesNOEXEC,MultiViews,SymLinksIfOwnerMatch,FollowSymLinks,None
Options -ExecCGI -Includes +IncludesNOEXEC
<FilesMatch "\.(inc|php|phtml|phps|php56)$">
<If "-f %{REQUEST_FILENAME}">
#ProxyErrorOverride on
AddHandler "proxy:unix:/usr/local/php56/sockets/blog.sock|fcgi://localhost" .inc .php .phtml .php56
</If>
</FilesMatch>
</Directory>
</VirtualHost>
<VirtualHost 88.88.88.88:80 >
ServerName www.sub1.domain2.com
ServerAlias www.sub1.domain2.com news.domain2.com
ServerAdmin webmaster#blog.com
DocumentRoot /home/blog/domains/blog.com/public_html/sub1
UseCanonicalName OFF
<IfModule !mod_ruid2.c>
SuexecUserGroup blog blog
</IfModule>
CustomLog /var/log/httpd/domains/blog.com.sub1.bytes bytes
CustomLog /var/log/httpd/domains/blog.com.sub1.log combined
ErrorLog /var/log/httpd/domains/blog.com.sub1.error.log
<Directory /home/blog/domains/blog.com/public_html/sub1>
AllowOverride AuthConfig FileInfo Indexes Limit Options=Indexes,IncludesNOEXEC,MultiViews,SymLinksIfOwnerMatch,FollowSymLinks,None
Options -ExecCGI -Includes +IncludesNOEXEC
<FilesMatch "\.(inc|php|phtml|phps|php56)$">
<If "-f %{REQUEST_FILENAME}">
#ProxyErrorOverride on
AddHandler "proxy:unix:/usr/local/php56/sockets/blog.sock|fcgi://localhost" .inc .php .phtml .php56
</If>
</FilesMatch>
</Directory>
</VirtualHost>
<VirtualHost 88.88.88.88:80 >
ServerName www.sub1.domain3.com
ServerAlias www.sub1.domain3.com sub1.domain3.com
ServerAdmin webmaster#blog.com
DocumentRoot /home/blog/domains/blog.com/public_html/sub1
UseCanonicalName OFF
<IfModule !mod_ruid2.c>
SuexecUserGroup blog blog
</IfModule>
CustomLog /var/log/httpd/domains/blog.com.sub1.bytes bytes
CustomLog /var/log/httpd/domains/blog.com.sub1.log combined
ErrorLog /var/log/httpd/domains/blog.com.sub1.error.log
<Directory /home/blog/domains/blog.com/public_html/sub1>
AllowOverride AuthConfig FileInfo Indexes Limit Options=Indexes,IncludesNOEXEC,MultiViews,SymLinksIfOwnerMatch,FollowSymLinks,None
Options -ExecCGI -Includes +IncludesNOEXEC
<FilesMatch "\.(inc|php|phtml|phps|php56)$">
<If "-f %{REQUEST_FILENAME}">
#ProxyErrorOverride on
AddHandler "proxy:unix:/usr/local/php56/sockets/blog.sock|fcgi://localhost" .inc .php .phtml .php56
</If>
</FilesMatch>
</Directory>
</VirtualHost>